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Message-Id: <1309311874-23262-2-git-send-email-john.johansen@canonical.com> Date: Wed, 29 Jun 2011 02:44:33 +0100 From: John Johansen <john.johansen@...onical.com> To: linux-kernel@...r.kernel.org Cc: linux-security-module@...r.kernel.org, stable@...nel.org Subject: [PATCH 1/2] AppArmor: Fix reference to rcu protected pointer outside of rcu_read_lock The pointer returned from tracehook_tracer_task() is only valid inside the rcu_read_lock. However the tracer pointer obtained is being passed to aa_may_ptrace outside of the rcu_read_lock critical section. Mover the aa_may_ptrace test into the rcu_read_lock critical section, to fix this. Kernels affected: 2.6.36 - 3.0 Reported-by: Oleg Nesterov <oleg@...hat.com> Cc: stable@...nel.org Signed-off-by: John Johansen <john.johansen@...onical.com> --- security/apparmor/domain.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c index c825c6e..78adc43 100644 --- a/security/apparmor/domain.c +++ b/security/apparmor/domain.c @@ -73,7 +73,6 @@ static int may_change_ptraced_domain(struct task_struct *task, cred = get_task_cred(tracer); tracerp = aa_cred_profile(cred); } - rcu_read_unlock(); /* not ptraced */ if (!tracer || unconfined(tracerp)) @@ -82,6 +81,7 @@ static int may_change_ptraced_domain(struct task_struct *task, error = aa_may_ptrace(tracer, tracerp, to_profile, PTRACE_MODE_ATTACH); out: + rcu_read_unlock(); if (cred) put_cred(cred); -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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